光纤光栅高速动态振动信号解调技术的研究

Study on demodulate technique of high-speed dynamic vibration signal for fiber grating

研究了一种基于放大自发辐射光源（ASE）的光纤布拉格光栅（FBG）振动传感解调系统。利用改进光源的基础上,在线性边带的上升沿2.5 nm范围内,线性拟合度达到了0.999 4,实现了波长线性解调,动态测量范围达到40~50 dB。实验表明,本文提出的解调系统结构简单、响应速度快、输出线性好,适合高速动态信号的检测。

A demodulation system for fiber Bragg grating（FBG） vibration sensor based on amplified spontaneous emission（ASE） is studied.Using the improved light source,the degree of linear fitting is0.999 4,the linear demodulation for wavelength is realized in the linear range of 2.5 nm rising edge,and the dynamic measurement range can reach 40-50 dB.The results indicate that this demodulation system has simple structure,fast response speed and good output linearity,and is very suitable for measurement of high-speed dynamic signals.